When you're working with contracts, reports, invoices, manuals, or academic documents, page numbers make navigation much easier. Instead of manually editing every page, modern JavaScript libraries let you add page numbers directly inside the browser. In this tutorial, you'll build a browser-based PDF page numbering tool using JavaScript. Users will be able to upload a PDF, choose where page numbers appear, customize formatting options, preview the document, and download the updated PDF without uploading files to a server. Everything runs locally inside the browser for better privacy and faster processing. Table of Contents How PDF Page Numbering Works Project Setup What Library Are We Using?…